I just installed Ubuntu 9.10 and the installation went smoothly. At the desktop I went to try and browse firefox. It froze and I was forced to force shutdown. I return to my desktop and Ubuntu would show its logo and the screen went black. I had a wireless mouse in the usb port so I thought it was trying to read from there. I took out the device and forced quit again. I started it back up and it gave me the logo, then options to start normally or safe mode ect. I hit enter to start normally, then suddenly, black screen. I have forced shutdown a few times (I know not good) but all I get is blackscreen. I dont even see the startup menu. Please help.